| Summary: | As global energy resources gradually become depleted, the development and application of renewable energy sources have become increasingly urgent and necessary. In the field of solar power generation, the efficiency of photovoltaic generation is mainly influenced by the inverter. Compared to conventional two-level inverter, the three-level inverter offers several advantages in efficiency and waveform quality. Its output waveform is closer to a sine wave with fewer harmoniccontents. In the topology of the classic three-level inverters, T-type inverters have lower costs and fewer power devices.Therefore, the focus of this study is the three-level T-type inverter. To improve the efficiency of the entire system, this study replaces IGBT with SiC MOSFET and adopts interleaved technology to reduce current ripple and lower costs and volume. The effectiveness of the interleaved inverter at high power was verified through principle analysis and PLECS simulation, and the inverter was closed-loop controlled for grid connection using quasi-PR controllers. Meanwhile, the method of duty cycle compensation distribution was used to solve the problem of current imbalance under interleaved operation. The results showed that the T-type three-level interleaved parallel inverter designed in this study has higher waveform quality and efficiency. In summary, this study demonstrates that the use of T-type three-level interleaved parallel inverters in the field of photovoltaic power generation can significantly improve the efficiency and waveform quality of the system, thereby promoting the development and application of renewable energy technologies.
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